Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a 1ª perna da Rodada que tem uma 2ª perna de 1-3 e a Equipe 1 Es Tunis?
 ###Tabelas: CREATE TABLE titleholders (titleholders_id AUTO_INCREMENT PRIMARY KEY, Year INT, Country/Territory VARCHAR, Miss International VARCHAR, National title VARCHAR, Location VARCHAR) CREATE TABLE consolation_round_7-12_place (consolation_round_7-12_place_id AUTO_INCREMENT PRIMARY KEY, Games INT, Drawn INT, Lost INT, Points difference VARCHAR, Points INT) CREATE TABLE summary_of_qualification (summary_of_qualification_id AUTO_INCREMENT PRIMARY KEY, Confederation VARCHAR, Teams started VARCHAR, Teams that have secured qualification VARCHAR, Teams that can still qualify VARCHAR, Teams that have been eliminated VARCHAR, Remaining places in finals VARCHAR, Total places in finals VARCHAR, Qualifying start date VARCHAR, Qualifying end date VARCHAR) CREATE TABLE second_round (second_round_id AUTO_INCREMENT PRIMARY KEY, Team 1 VARCHAR, Agg. VARCHAR, Team 2 VARCHAR, 1st leg VARCHAR, 2nd leg VARCHAR) CREATE TABLE season_2006 (season_2006_id AUTO_INCREMENT PRIMARY KEY, Position INT, Club VARCHAR, Played INT, H-Win INT, H-Draw INT, A-Win INT, A-Draw INT, Lost INT, Def. INT, Pts For INT, Pts Agst INT, Pair INT, Long INT, Points INT, Average VARCHAR)  
SELECT 1st leg FROM second_round WHERE 2nd leg = 1-3 AND Team 1 = es tunis